Pressure electric switch



Aug. 5, 1931. F. c. GEILER' 1,820,063

PRESSURE ELECTRIC SWITCH Filed Aug. 9, 1926 2 Sheets-Sheet l INVENTOR. FREDERICK C. E/LER,

A TTORNEYS.

Patented Aug. 25, 1931 UNITED STATES PATENT OFFICE FREDERICK C. GEIIIER, OF DAYTON, OHIO, ASSIGNOR, BY .llESNE ASSIGNMENTS, 1U FRIGIDAIRE CORPORATION, A'CORPORATION OF DELAWARE PRESSURE ELECTRIC SWITCH Application filed August 9, 1926. Serial No. 128,022.

7 My invention relates to switches and in particular to a pressure electric switch.

The object of my invention is to provide a pressure electric switch in which the contact will be made and broken suddenly by a mercury contact member.

It is a further object to provide such a switch which will be operated primarily by the pressure in the system to which it is attached, as in a refrigerating system.

It is my object to provide means of adjusting the point at which the circuit will be closed by the pressure in the system and means to adjust the rangeof movement of the cut out.

It is a further object of my invention to provide a safety pressure switch operating means which will cooperate with the first mentioned pressure means to break the circuit when the pressure in the system exceeds a' definite safety point.

Referring to the drawings:

Figure 1 is a front elevation of the switch box with the cover removed showing the parts in elevation with the exception of the differential spring which is in section;

Figure 2 is an enlarger section of the mercury switch member;

Figure 3 is a top plan view of the mechanism with the top of the' cover removed.-

, Figure 4 is an end elevation looking from the left end of Figure 1 to the right.

Referring to the drawings in detail, 1 and 2 designate the end walls of the box, while 3 and 4 designate the bottom and top thereof. The side walls are designated 5. The box is provided with an inwardly extending rib 6 which terminates in an eye supporting a pivot bolt 7 approximately one-half the depth of the box.

On this pivot bolt is mounted a lever designated 8, the other end of which 9 sup ports a diflerential spring 10, the tension of which is determined by the screwcplug 11 engaging its other end, which screw plug is carried by the top 4 of the casing 1. Within this screw 11 is a second screw 12 having an actuating head 13. The screw 12 carries an eye 14 at its lower end on which is suspended the range spring 15, theother end.

- glass 27. This of which'is hooked in the eye 16 in the other end of the lever 8 designated 9. The

sition in the top 4 by the collar 18 an is connected to a suitable pipe by the threaded collar 19. This pipe leads to a pressure system, such as a refrigerator system.

The extreme end of the lever 8 carries a plate spring 20, the free end of which ongages with a pin 21 carried on the arm 22 of a toggle joint. This pin is connected with a pin 23 pivotally to the end of the lever 8. The spring furnishes pressure tending to thrust the arm 22 inwardly. This arm 22 is pivoted at 24, to the second arm of the bell crank at 25. Moving with this arm 25 in the clips 26 is a mercury tube of tube contains a quantity of mercury 28. The tube itself is restricted at 29 thus forming a hump 30 in the bottom thereof. In one end of the tube are located the terminals 31 and 32 of the electric circuit, the wires from which, designated 33 and 34,'"pass out of the seals 35 and 36 at the upper ends of the tube. The lever arm 25 is pivotally supported on a lug 37 by the screw 38. The wires 33 and 34 passing out of the glass tube are connected to the terminals 39 and 40 on the bar of insulation carries a plurality of such terminals and connects-the wires of the circuit which are a part of the remainder of the system.

The emergency systemfor operating this switch consists of a lever having a switch operating end 42 suspended on a depending arm 43 carried on the pivot 7 The other end of the arm 44 is formed into a bracket I material 41 carried in the box. This bar I and seat 45, the upper portion of which supports a metallic bellows or sylphon 46 and the upper end of a relatively heavy hehcal spring 47 which is; adjustably supported on the screw support 48 in the bottom of the lower part of which engages the cabinet. The arch-shaped form of the lever 44 maintains the lateral position of the spring 47 The upper sylphon 46 is suspended by a collar 4.9 in the upper wall 4 of the cabinet and is connected to a suitable pressure pipe by the screw pipe 50. Ihis pipe leads to the condenser of the refrigeration system.

A stop pin 51 isprovided for limiting the movement of the toggle members. A stop pin 52 is provided for limiting the movement of the lever 8. Support members 53 are connected on the rear wall of the housing for supporting the bar 41 of insulated material.

Generally speaking, it is my ordinary object in a switch oi this character to provide means for cutting in and out the electric motor operating the compressor of the refrigerator at some predetermined pressure of, for instance, from live pounds to seven pounds.

It is a further object to provide the safety feature so that if the pressure becomes excessive in the condenser, say exceeding 135 pounds, then the cylphon 46 will expand and independently break the circuit preventing any further increase in pressure.

t will be understood that I desire to comprehend within my invention such modiconnection with said contact means, and an emergency pressure actuator having a connection with said contact means independent of said lost motion connection.

2. In a switch, movable contact means, a normal pressure actuator having lost motion connection with said contact means, an emergency pressure actuator having a connection with'said contact means independent of said lost motion connection, and means for adjusting said normal pressure actuator.

3. In a switch, movable contact means, a normal pressure actuator having lost motion connection with said contact means, an emergency pressure actuator having a connection with said contact means independent of said lost motion connection, and means for adjusting said emergency pressure actuator.

4:. In a switch, movable contact means, a normal pressure actuator having lost motion connection with said contact means, an emergency pressure actuator having a connection with said contact means independent of said lost motion connection, means for adjusting said normal pressure actuator, and means for adjusting said emergency pressure actuator. v

5. In a switch, movable contact means, a pressure actuator therefor, an adjustable spring for regulating said pressure actuator,-

and another adjustable spring concentric with said first mentioned spring for adjusting the total spring regulation of said pressure actuator.

6. In a switch, a regulating coil spring, an adjusting screw for said spring, a second regulating coil spring concentric with said first mentioned spring, and an adjusting screw for said second regulating spring.

7. In a switch, a regulating coil spring, an adjusting screw for said spring, a second regulating coil spring concentric with said first mentioned spring, and an adjusting screw for said second regulating spring, said adjusting screws being concentric.

8. In .a switch, movable fluid contact means, a normal pressure actuator having a connection with said fluid contact means and an emergency pressure actuator having a connection with said fluld contact means independent of said first mentioned connection.

9. In a switch, movable fluid contact emergency pressure actuator having a connection with said contact means independent of said first mentioned connection and means for adjusting said emergency pressure actuator.

11. In a switch, movable fluid contact means, a normal pressure actuator having a connection with said fluid contact means, an emergency pressure actuator having a connection with said fluld contact means independent of saidfirst mentioned connection, means for adjusting said normal pressure actuator and means for adjusting said emergency pressure actuator.

12. In an automatic controllin device, a lever, a variable pressure means or moving said lever in one direction, means tending to move said lever in the opposite direction, an arm, means of connection between said arm and said lever for allowing movement of the arm independent of the lever and in unison therewith and pressure means independent of said first pressure means in operative relation to said means of connection for imparting movement to the arm without affecting movement of said lever.

In testimony whereof, I aflix my signa- 

